A load control system may include control devices for controlling power provided to an electrical load. The control devices may include an input device and a load control device. The load control system may include a hub device. The hub device may include a communication circuit and a control circuit. The communication circuit may be configured to receive a digital message from the control device. The control circuit may be configured to determine, based on content of the digital message, whether the control device has experienced a power removal event. The hub device may send, via the communication circuit, a power removal event indication to the control device of whether the control device has experienced the power removal event.

An article and circuit that controllably dims a luminaire, for example without controlling a line power of the luminaire. The luminaire includes a traditional three-contact socket to receive a photocontroller, such as that used for street lights. The article uses a desired dimming control signal to provide an output control signal that controls whether the light source in the luminaire is turned ON or turned OFF to thereby effect the desired amount of dimming. The output control signal may be a pulse width modulated (PWM) signal with a duty cycle that is related to the desired level of illumination or dimming. The system may use a dimming signal from a five or seven contact dimming photocontroller to provide such an output control signal to control the light-level for the luminaire.

A light system for a stadium, the light system comprising: at least one sensor configured to determine light intensity values for multiple locations within the stadium; at least one electronically controllable luminaire configured to generate light directed towards at least one location of the multiple locations within the stadium based on a received control parameter; a controller configured to receive the light intensity values from the at least one sensor, further configured to determine a light intensity difference based on the light intensity values from the multiple locations within the stadium, and configured to select the at least one electronically controllable luminaire and generate the control parameter for the least one electronically controllable luminaire based on the light intensity difference to attempt to reduce the light intensity difference.

A control system including: a base including a central axis; a knob rotatably connected to the base, the knob rotatable about the central axis; a plurality of individually indexed light emitting elements distributed along the base perimeter and arranged to direct light radially outward of the central axis; a diffuser arranged radially outward of the light emitting elements; a wireless communication module enclosed between the knob and base; and a processor enclosed between the knob and base, the processor connected to the wireless communication mechanism and plurality of light emitting elements, the processor configured to individually control each light emitting element based on a control signal received from the wireless communication mechanism.

A method and apparatus for switching AC power to a lamp (or other load) via a two terminal switch device. The switch device comprises a first electrically controlled switch, such as a triac or relay, and a second electrically controlled resistance or switch connected in series to the first switch. A diode is connected in parallel to the second switch. When the first switch is open, only a leakage current is flowing through the switch device, supplied to an AC/DC converter for producing a low DC voltage to the switch device logic and other low-voltage circuits and for charging a capacitor. When the first switch is closed, the second switch is controlled to be conductive for allowing powering the lamp from the AC power. During part of a positive half-cycle of the AC voltage, a closed loop regulates a DC voltage over the second switch terminals for providing a low DC voltage for charging a capacitor. At least during a negative half-cycle of the AC voltage, the low DC voltage is provided from the capacitor.

A load control system may include control devices for controlling power provided to an electrical load. The control devices may include an input device and a load control device. The load control system may include a hub device. The hub device may include a communication circuit and a control circuit. The communication circuit may be configured to receive a digital message from the control device. The control circuit may be configured to determine, based on content of the digital message, whether the control device has experienced a power removal event. The hub device may send, via the communication circuit, a power removal event indication to the control device of whether the control device has experienced the power removal event.

A resistor bypass circuit for a series lighting circuit includes a plurality of serially connected light sources and a bypass resistor being connected in parallel with at least one of the respective light sources, each respective light source being low wattage and being capable operating on a one hundred percent duty cycle as desired.

A control system including: a base including a central axis; a knob rotatably connected to the base, the knob rotatable about the central axis; a plurality of individually indexed light emitting elements distributed along the base perimeter and arranged to direct light radially outward of the central axis; a diffuser arranged radially outward of the light emitting elements; a wireless communication module enclosed between the knob and base; and a processor enclosed between the knob and base, the processor connected to the wireless communication mechanism and plurality of light emitting elements, the processor configured to individually control each light emitting element based on a control signal received from the wireless communication mechanism.

A dual-control dimming system is disclosed. The dual-control dimming system is configured to automatically change control of an LED between two control loops as an LED output is adjusted over a dimmable range. A first control loop may take control of the LED output in a first portion of the dimmable range, while the second loop may take control of the LED output in a second portion of the dimmable range. In this way, the LED may be powered efficiently in the first portion, while providing stable (i.e., flicker-free) output in the second portion.

A control device configured for use in a load control system to control one or more electrical loads may comprise an actuation member having a front surface defining a touch sensitive surface configured to detect a point actuation along at least a portion of the front surface, a touch sensitive circuit, and a control circuit. The touch sensitive device may comprise one or more receiving capacitive touch pads located behind the actuation member and arranged in a linear array adjacent to the touch sensitive surface. The control circuit may be configured to operate using different filtering techniques based on the state/mode of the control device and/or based on whether the positions of point actuations by a user along the touch sensitive surface indicate a fine tune or gross adjustment by the user. For example, the control circuit may generate an output signal using light/no filtering or using heavy filtering.